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A kind of silicate fluorescent material for LED white light with single matrix and three primary colors and preparation method thereof

A fluorescent material and silicate technology, applied in the field of fluorescent materials, can solve problems such as inconsistent attenuation rates of three primary color chips, impure white light chromaticity, influence on device lumen efficiency and color reproduction, and achieve low cost of raw materials and excellent luminous performance Good, stable physical and chemical properties

Active Publication Date: 2020-07-28
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the problems of color reabsorption and ratio control among the three mixed phosphors, the lumen efficiency and color reproduction of the device are greatly affected.
Moreover, due to the inconsistent attenuation rate of the light emitted by the three primary color chips, the chromaticity of the white light emitted by them is not pure.

Method used

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  • A kind of silicate fluorescent material for LED white light with single matrix and three primary colors and preparation method thereof
  • A kind of silicate fluorescent material for LED white light with single matrix and three primary colors and preparation method thereof
  • A kind of silicate fluorescent material for LED white light with single matrix and three primary colors and preparation method thereof

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Experimental program
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Effect test

preparation example Construction

[0036] The preparation and detection process of the present invention comprises:

[0037] 1. Material preparation: A variety of activators excited by near-ultraviolet light are doped with a single matrix for LED silicate luminescent materials. Examples of fluorescent silicates as luminous bodies are as follows: Ca 2 Y 8-x-y-z (SiO 4 ) 6 o 2 :xEu 3+ ,yBi 3+ , zTb 3+ (02 o 3 、 Bi 2 o 3 and Tb 2 o 3 or Tb 4 o 7 ; The flux is H 3 BO 3 、B 2 o 3 One or two of them, the added amount is 0.01-5% of the weight of the silicate material.

[0038] The present invention also provides the Ca 2 Y 8-x-y-z (SiO 4 ) 6 o 2 :xEu 3+ ,yBi 3+ , zTb 3+ (0

[0039] Step 1. Accurately weigh each raw material according to the proportion of the silicate compound, and pour the raw materials into an agate mortar;

[0040] Step 2, drop a certain amount of ethanol into the material described in step 1, make the etha...

Embodiment 1

[0050] A variety of activators doped with a single matrix excited by near-ultraviolet light in this embodiment are used in the LED silicate luminescent material Ca 2 Y 8－x-y-z (SiO 4 ) 6 o 2 :xEu 3+ ,yBi 3+ , zTb 3+ (x=0.01, y=0.015, z=0.03), weigh each raw material according to the silicate compounding ratio, activator, and flux. The raw materials are calcium carbonate, yttrium oxide and silicic acid, and the activator is Eu 2 o 3 (x=0.01), Bi 2 o 3 (y=0.015) and Tb 2 o 3 (z=0.03), the flux is B 2 o 3 (for the silicate material Ca 2 Y 8－x-y-z (SiO 4 ) 6 o 2 3% by weight).

[0051] The preparation method of the near-ultraviolet-excited single-matrix trichromatic silicate fluorescent material of this embodiment is as follows:

[0052] Step 1. Accurately weigh each raw material according to the silicate mix ratio, and weigh the calcium carbonate, yttrium oxide, silicic acid, Eu 2 o 3 、 Bi 2 o 3 , Tb 2 o 3 and B 2 o 3 Pour into an agate mortar;

[005...

Embodiment 2

[0059] A variety of activators doped with a single matrix excited by near-ultraviolet light in this embodiment are used in the LED silicate luminescent material Ca 2 Y 8－x-y-z (SiO 4 ) 6 o 2 :xEu 3+ ,yBi 3+ , zTb 3+ (x=0.01, y=0.015, z=0.04), weigh each raw material according to the silicate compounding ratio, activator, and flux. The raw materials are calcium oxide, yttrium oxide and silicic acid, and the activator is Eu 2 o 3 (x=0.01), Bi 2 o 3 (y=0.015) and Tb 4 o 7 (z=0.04), the flux is H 3 BO 3 (3% by weight of the silicate material).

[0060] The preparation method of the near-ultraviolet-excited single-matrix trichromatic silicate fluorescent material of this embodiment is as follows:

[0061] Step 1. Accurately weigh each raw material according to the silicate mix ratio, and weigh the weighed calcium oxide, yttrium oxide, silicic acid, Eu 2 o 3 、 Bi 2 o 3 , Tb 2 o 3 and B 2 o 3 Pour into an agate mortar;

[0062] Step 2. Add a certain amount of ...

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PUM

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Abstract

Provided is a single-matrix and three-primary-color silicate fluorescence material for a white-light LED and a preparation method thereof. According to the proportion of 0 < x <= 0.5, 0 < y <= 0.5 and 0 < z <= 0.5 in Ca2Y8-x-y-z(SiO4)6O2: xEu<3+>, yBi<3+> and zTb<3+>, raw materials and activating agents are mixed to obtain a mixed material; ethyl alcohol is dropwise added into the mixed material, grinding and mixing are performed till the materials are evenly mixed, then firing reaction is performed. By utilizing three or more activating agents in a single matrix, blue, green and red light can be simultaneously transmitted through near ultraviolet excitation, and the material can be used for the white-light LED and relevant display and illuminating devices. The preparation method is simple, the raw materials are low in cost, the prepared material has stable physical and chemical properties, good luminescence property and controllable color temperature, and is an ideal candidate fluorescence powder for white-light LEDs in the future.

Description

technical field [0001] The invention belongs to the field of fluorescent materials, and in particular relates to a silicate fluorescent material with single matrix and three primary colors used for LED white light and a preparation method thereof. Background technique [0002] The worldwide energy crisis has caused people to pay more and more attention to energy-saving and environment-friendly materials. Light-emitting diodes (LEDs) have shown great potential in terms of energy saving and lifespan. In the field of lighting, white LED has become the most promising lighting technology in this century because of its high luminous efficiency, low energy consumption, long life, no pollution and many other advantages. Compared with traditional incandescent lamps and fluorescent lamps, white LEDs have energy saving (low voltage, low current start), environmental protection (mercury-free, waste can be recycled), long life (more than 100 000h), shock resistance, not easy to damage, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/79
CPCC09K11/7792Y02B20/00
Inventor 汪敏强孙志华杨智
Owner XI AN JIAOTONG UNIV